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/*
* Interface for ICL71c03 ADC
* Designed for the Keithley 179 True RMS Multimeter
*/
//#ifndef F_CPU
#define F_CPU 4000000UL //4MHz
//#endif
#include <avr/io.h>
#include <avr/interrupt.h>
#define UART_BAUDRATE 960
#define baudrate ((F_CPU / UART_BAUDRATE * 16) - 1)
//Locations of ADC Outups (ICL71c03)
#define b1 PC0
#define b2 PC1
#define b3 PC2
#define b4 PC3
#define d1 PD7
#define d2 PD4
#define d3 PD5
#define d4 PD6
#define d5 PC3
#define busy PB7 //Busy not Used
//Status
uint8_t UART_RX;
uint8_t UART_RX_END;
uint8_t UART_isInit;
//Buffers
char out[5]; //Buffer for ADC Input
char in[16]; //UART Input Buffer
uint8_t in_cntr; //Counter for UART Input Buffer
//UART Rcieve Interrupt
ISR(USART_RXC_vect)
{
cli();
in[in_cntr] = UDR;
if(in[in_cntr] == '\n')
UART_RX_END = 1; //Set RX End Flag
//Check if Buffer is full
if(in_cntr < 15)
in_cntr ++;
else
{
in_cntr = 0;
UART_RX_END = 1; //Set RX End Flag
}
sei();
}//USART_RXC_vect
//Prototypen
void UART_Init();
/*
*Initializes the UART Interface
*/
void UART_Handle();
/*
* Handles UART Communication
* Not Implemented
*/
void UART_Send(char *_cSend);
/*
*Sends String over UART
*/
void UART_Putc(unsigned char c);
//Startpoint
int main(void)
{
//clear Buffers
for(int i = 0; i < 5;i++)
{
out[i] = 0;
}
for(int i = 0; i < 16;i++)
{
in[i] = 0;
}
//Init Status vars
char temp = 0;
in_cntr = 0;
UART_RX = 0;
UART_RX_END = 0;
UART_isInit = 0;
//Set Inputs
DDRD = 0;
DDRC = 0;
DDRD |= (1<<PD1); //TX Pin
sei();
//INIT UART Interface
UART_Init();
//UART_Send("Hello World!");
UART_Putc('A');
//main loop
while(1)
{
while(!(PORTD & (1<<d1)));
temp = PINB << 4;
out[4] = temp >> 4;
temp = 0;
while(!(PORTD & (1<<d2)));
temp = PINB << 4;
out[3] = temp >> 4;
temp = 0;
while(!(PORTD & (1<<d3)));
temp = PINB << 4;
out[2] = temp >> 4;
temp = 0;
while(!(PORTD & (1<<d4)));
temp = PINB << 4;
out[1] = temp >> 4;
temp = 0;
while(!(PORTC & (1<<d5)));
temp = PINB << 4;
out[0] = temp >> 4;
temp = 0;
//Convert to ASCII
for(int i = 0; i < 5;i++)
{
out[i] = out[i] + 48;
}
UART_Send(out);
//Handle UART
//UART_Handle(); //Not Used
//Reset Buffer
for(int i = 0; i < 5;i++)
{
out[i] = 0;
}
}
return 0;
}//main
void UART_Init()
{
if(UART_isInit == 0)
{
//Calculate Value for Register
//uint16_t baudrate = (F_CPU / (UART_BAUDRATE * 16)) - 1;
//Set Baudrate
UBRRL = baudrate;
UBRRH = (baudrate >> 8);
UCSRB |= (1<<RXEN) | (1<<TXEN); //Enable Reciever and Transmitter
UCSRB |= (1<<RXCIE); //Enable Recieve Complete Interrupt
UART_isInit = 1;
}
}//UART_Init
void UART_Handle()
{
if(UART_isInit == 1 && UART_RX_END == 1)
{
//Not Used
//char in[16] is UART InputBuffer
}
}//UART_Handle
void UART_Send(char *_cSend)
{
if(UART_isInit == 1)
{
while(*_cSend)
{
/*while (!(UCSRA & (1<<UDRE)));
UDR = *_cSend;*/
UART_Putc(*_cSend);
_cSend++;
}
}
}//UART_send
void UART_Putc(unsigned char c)
{
while (!(UCSRA & (1<<UDRE)));
UDR = c;
}
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